Abstract: An intelligent workflow management system should have the ability to dynamic analyze and optimize workflow process to improve performance and efficiency．This paper presents a semantic-based workflow optimization method，which uses ontology to describe the concept of the workflow，endows the workflow model with corresponding dynamic semantic，so as to construct a workflow fact library； by defining a set of classification rules of activity，to classify all of the workflow activities semantically and construct a library of classification rules； by performing these classification rules，to acquire optimized information，and performing corresponding operation according to different activities，so as to optimize the structure of the workflow model.An example is given to illustrate the feasibility and correct of the method.

Key words: workflow process optimization, semantic, ontology, classical rule

摘要： 为改善工作流的性能和效率，一个智能化的工作流系统应该具有动态的分析和优化工作流过程的能力。提出了一种基于语义的工作流优化方法，它使用本体概念来描述工作流，利用本体技术的知识表达能力，给工作流模型赋以相应的动态语义，从而构建工作流事实库；通过制定基于本体的活动分类规则，对工作流的所有活动进行语义分类，从而构建分类规则库；通过执行活动分类规则来获取优化信息，针对不同类别的活动执行相应的操作，从而实现对工作流模型的结构优化。最后，通过实例来说明该方法的可行性和正确性。

关键词: 工作流过程优化, 语义, 本体, 分类规则